Question 360083
18 - 10y <= 63 + 5y
add 10y
18-10y+10y<=63+5y+10y
18<=63+15y
add -63
18-63<=63-63+15y
-45<=15y
multiply by 1/15
-45*1/15 <=15y*1/15
-3<=y
...
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